sunrpc: Make xprt auth cache release work with the xprt

This is done in order to facilitate getting the ip_map_cache from
which to put the ip_map.
Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

include/linux/sunrpc/svcauth.h

@@ -116,6 +116,7 @@ struct auth_ops {
 #define	SVC_PENDING	9
 #define	SVC_COMPLETE	10
 
+struct svc_xprt;
 
 extern int	svc_authenticate(struct svc_rqst *rqstp, __be32 *authp);
 extern int	svc_authorise(struct svc_rqst *rqstp);
@@ -131,7 +132,7 @@ extern struct auth_domain *auth_domain_find(char *name);
 extern struct auth_domain *auth_unix_lookup(struct in6_addr *addr);
 extern int auth_unix_forget_old(struct auth_domain *dom);
 extern void svcauth_unix_purge(void);
-extern void svcauth_unix_info_release(void *);
+extern void svcauth_unix_info_release(struct svc_xprt *xpt);
 extern int svcauth_unix_set_client(struct svc_rqst *rqstp);
 
 static inline unsigned long hash_str(char *name, int bits)

net/sunrpc/svc_xprt.c

@@ -128,9 +128,8 @@ static void svc_xprt_free(struct kref *kref)
 	struct svc_xprt *xprt =
 		container_of(kref, struct svc_xprt, xpt_ref);
 	struct module *owner = xprt->xpt_class->xcl_owner;
-	if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags) &&
-	    xprt->xpt_auth_cache != NULL)
-		svcauth_unix_info_release(xprt->xpt_auth_cache);
+	if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags))
+		svcauth_unix_info_release(xprt);
 	xprt->xpt_ops->xpo_free(xprt);
 	module_put(owner);
 }

net/sunrpc/svcauth_unix.c

@@ -472,10 +472,13 @@ ip_map_cached_put(struct svc_rqst *rqstp, struct ip_map *ipm)
 }
 
 void
-svcauth_unix_info_release(void *info)
+svcauth_unix_info_release(struct svc_xprt *xpt)
 {
-	struct ip_map *ipm = info;
-	cache_put(&ipm->h, &ip_map_cache);
+	struct ip_map *ipm;
+
+	ipm = xpt->xpt_auth_cache;
+	if (ipm != NULL)
+		cache_put(&ipm->h, &ip_map_cache);
 }
 
 /****************************************************************************